TiO₂-Based PVDF Integrated Photocatalytic Membrane with Excellent MB Dye Degradation Performance

Photocatalytic technology has attracted great attention in environmental treatment in recent years due to its environmental friendliness. However, the commonly used photocatalyst TiO₂ cannot effectively utilize visible light due to its wide bandgap, and the difficulty in recycling the powder catalyst limits the further development of photocatalysis. In this paper, we report a novel PVDF membrane loaded with TiO₂/GN/Ag NWs for photocatalytic degradation of MB dye wastewater in the presence of SA by simple vacuum filtration of the photocatalysts loaded on the PVDF membrane, the addition of GN and Ag NWs successfully shortened the band gap of the PVDF/SA/TiO₂ membrane (3.2 eV) to that of the PVDF/GN/SA/TiO₂/Ag₁₂ membrane (2.6 eV), which effectively enlarged the utilization of TiO₂ for visible light and demonstrated efficient and stable photocatalytic degradation of MB dye wastewater under simulated sunlight, and furthermore, the removal efficiency of MB dye wastewater was still maintained at 86% after 5 cycles. This work provides a possibility for the application of TiO₂-based PVDF membranes in the photocatalytic degradation of dye wastewater.